With an electric mixer on medium-high speed, cream butter and sugar until pale and fluffy. Reduce speed to medium. Add whole eggs, one at a time, beating until each is incorporated, scraping down sides of bowl as needed. Add yolks, and beat until thoroughly combined. Reduce speed to low. Add flour mixture in three batches, alternating with two additions of buttermilk, and beating until combined after each. Beat in vanilla.

Divide batter evenly among lined cups, filling each three-quarters full. At this point it is time to add a small ball (about the size of a grape) of the raw cookie dough to the middle of each filled cup.

Bake, rotating tins halfway through, until cupcakes spring back when lightly touched and a cake tester inserted in centers comes out clean, about 20 minutes. Transfer tins to wire racks to cool 10 minutes; turn out cupcakes onto racks and let cool completely. Cupcakes can be stored overnight at room temperature, or frozen up to 2 months, in airtight containers.

Frost your Milk and Cookie Cupcakes with Swiss Meringue Buttercream and top with a baked Toll House cookie. YUM! Be sure to serve with a cold glass of milk.